/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.core.contentPage;

import com.blandware.atleap.common.Constants;
import com.blandware.atleap.model.core.ContentPage;
import com.blandware.atleap.model.core.Role;
import com.blandware.atleap.service.core.PageManager;
import com.blandware.atleap.service.core.RoleManager;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.SelectRolesForm;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import com.blandware.atleap.webapp.util.core.WebappUtil;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * <p>Returns page with two lists to reassign roles to content page
 * </p>
 * <p><a href="CallAssignContentPageRolesAction.java.html"><i>View Source</i></a></p>
 * <p/>
 *
 * @author Sergey Zubtsovskiy <a href="mailto:sergey.zubtsovskiy@blandware.com">&lt;sergey.zubtsovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.11 $ $Date: 2006/08/03 10:07:51 $
 * @struts.action path="/core/contentPage/callAssignRoles"
 * name="selectRolesForm"
 * validate="false"
 * roles="core-contentPage-assignRoles"
 * @struts.action-forward name="assignRoles"
 * path=".core.contentPage.assignRoles"
 * @struts.action-forward name="listContentPages"
 * path="/core/contentPage/list.do"
 * redirect="true"
 */
public final class CallAssignContentPageRolesAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		Long contentPageId = null;
		if ( request.getParameter("contentPageId") != null ) {
			contentPageId = Long.valueOf(request.getParameter("contentPageId"));
		} else if ( request.getAttribute(WebappConstants.CONTENT_PAGE_ID_KEY) != null ) {
			contentPageId = (Long) request.getAttribute(WebappConstants.CONTENT_PAGE_ID_KEY);
		} else {
			if ( log.isWarnEnabled() ) {
				log.warn("Missing content page ID. Returning to list...");
			}
			return mapping.findForward("listContentPages");
		}

		request.getSession().setAttribute(WebappConstants.CONTENT_PAGE_ID_KEY, contentPageId);

		SelectRolesForm selectRolesForm = (SelectRolesForm) form;
		PageManager pageManager = (PageManager) getBean(Constants.PAGE_MANAGER_BEAN);
		ContentPage contentPage = pageManager.retrieveContentPage(contentPageId);

		if ( contentPage == null ) {
			// content page not found. it might be deleted by someone else
			ActionMessages errors = new ActionMessages();
			errors.add("contentPageNotFound", new ActionMessage("core.contentPage.errors.notFound"));
			saveErrors(request, errors);
			return mapping.findForward("listContentPages");
		}

		selectRolesForm.setVersion(contentPage.getVersion().toString());

		List contentPageRoles = new ArrayList();
		for ( Iterator i = contentPage.getRoles().iterator(); i.hasNext(); ) {
			Role role = (Role) i.next();
			contentPageRoles.add(role);
		}

		RoleManager roleManager = (RoleManager) getBean(Constants.ROLE_MANAGER_BEAN);
		List availableRoles = roleManager.listRoles(null).asList();
        List allRoles = new ArrayList(availableRoles);
		availableRoles.removeAll(contentPageRoles);

		selectRolesForm.setAvailableRolesList(availableRoles);
		selectRolesForm.setSelectedRolesList(contentPageRoles);

        allRoles = WebappUtil.prepareRolesListForJs(allRoles);
        request.setAttribute("allRoles", allRoles);

		// save transaction token in request
		saveToken(request);
		return mapping.findForward("assignRoles");
	}
}